气流扰动下单液滴撞击单根干燥扁网丝特性数值研究

丝网分离器在工业中有着广泛地应用。本文针对液滴撞击网丝的动态过程,采用CLSVOF方法对单个液滴撞击干燥网丝的问题进行数值模拟,经过合理的简化,建立了气流扰动下单液滴撞击干燥扁网丝面的二维数学模型,分析了液滴撞击角和撞击位置对液滴撞击行为特性的影响。数值计算的结果表明:液滴撞击到干燥网丝上分为铺展和飞溅2个过程,撞击角越小,上铺展半径越大,下铺展半径越小,分离的二次液滴体积越大;液滴撞击网丝的位置离网丝边缘越近,越容易产生二次液滴,二次液滴的总体积越多。

Numerical Study on Characteristics of Single Droplet Impacting on Single Dry Flat Wire Mesh under Airflow Disturbance

Mesh separators are widely used in industry. Based on the dynamic process of droplet impact on the mesh in this paper, the CLSVOF method is used to solve the problem of single droplet impact on the dry flat wire mesh. After reasonable simplification, a two-dimensional mathematical model of the single droplet impacting mesh surface is established and analyzed. The effects of droplet impact angle and impact position on the behavior of droplet impacting were studied. The numerical results show that the droplets impacting on the dry mesh are divided into two processes: spreading and splashing. The smaller the impact angle, the bigger the front spreading radius, and the smaller the back spreading radius, the larger the volume of the daughter droplets; the closer the impact point is to the end of the mesh, the more likely to produce daughter droplets, the more the total volume of daughter droplets.